Vanadium is a chemical element with symbol V and atomic number 23. It is a hard, silvery-grey, ductile, malleable transition metal. The elemental metal is rarely found in nature, but once isolated artificially, the formation of an oxide layer (passivation) somewhat stabilizes the free metal against further oxidation.
|Standard atomic weight Ar, std(V)||50.9415(1)|
|Vanadium in the periodic table|
|Atomic number (Z)||23|
|Element category||transition metal|
|Electron configuration||[Ar] 3d3 4s2|
Electrons per shell
|2, 8, 11, 2|
|Phase at STP||solid|
|Melting point||2183 K (1910 °C, 3470 °F)|
|Boiling point||3680 K (3407 °C, 6165 °F)|
|Density (near r.t.)||6.0 g/cm3|
|when liquid (at m.p.)||5.5 g/cm3|
|Heat of fusion||21.5 kJ/mol|
|Heat of vaporization||444 kJ/mol|
|Molar heat capacity||24.89 J/(mol·K)|
|Oxidation states||−3, −1, +1, +2, +3, +4, +5 (an amphoteric oxide)|
|Electronegativity||Pauling scale: 1.63|
|Atomic radius||empirical: 134 pm|
|Covalent radius||153±8 pm|
|Spectral lines of vanadium|
|Crystal structure||body-centered cubic (bcc)|
|Speed of sound thin rod||4560 m/s (at 20 °C)|
|Thermal expansion||8.4 µm/(m·K) (at 25 °C)|
|Thermal conductivity||30.7 W/(m·K)|
|Electrical resistivity||197 nΩ·m (at 20 °C)|
|Magnetic susceptibility||+255.0·10−6 cm3/mol (298 K)|
|Young's modulus||128 GPa|
|Shear modulus||47 GPa|
|Bulk modulus||160 GPa|
|Vickers hardness||628–640 MPa|
|Brinell hardness||600–742 MPa|
|Discovery||Andrés Manuel del Río (1801)|
|First isolation||Nils Gabriel Sefström (1830)|
|Named by||Nils Gabriel Sefström (1830)|
|Main isotopes of vanadium|
Andrés Manuel del Río discovered compounds of vanadium in 1801 in Mexico by analyzing a new lead-bearing mineral he called "brown lead", and presumed its qualities were due to the presence of a new element, which he named erythronium (derived from Greek for "red") since, upon heating, most of the salts turned red. Four years later, however, he was (erroneously) convinced by other scientists that erythronium was identical to chromium. Chlorides of vanadium were generated in 1830 by Nils Gabriel Sefström who thereby proved that a new element was involved, which he named "vanadium" after the Scandinavian goddess of beauty and fertility, Vanadís (Freyja). Both names were attributed to the wide range of colors found in vanadium compounds. Del Rio's lead mineral was later renamed vanadinite for its vanadium content. In 1867 Henry Enfield Roscoe obtained the pure element.
Vanadium occurs naturally in about 65 minerals and in fossil fuel deposits. It is produced in China and Russia from steel smelter slag; other countries produce it either from magnetite directly, flue dust of heavy oil, or as a byproduct of uranium mining. It is mainly used to produce specialty steel alloys such as high-speed tool steels. The most important industrial vanadium compound, vanadium pentoxide, is used as a catalyst for the production of sulfuric acid. The vanadium redox battery for energy storage may be an important application in the future.
Large amounts of vanadium ions are found in a few organisms, possibly as a toxin. The oxide and some other salts of vanadium have moderate toxicity. Particularly in the ocean, vanadium is used by some life forms as an active center of enzymes, such as the vanadium bromoperoxidase of some ocean algae.
Vanadium was discovered by Andrés Manuel del Río, a Spanish-Mexican mineralogist, in 1801. Del Río extracted the element from a sample of Mexican "brown lead" ore, later named vanadinite. He found that its salts exhibit a wide variety of colors, and as a result he named the element panchromium (Greek: παγχρώμιο "all colors"). Later, Del Río renamed the element erythronium (Greek: ερυθρός "red") because most of the salts turned red upon heating. In 1805, the French chemist Hippolyte Victor Collet-Descotils, backed by del Río's friend Baron Alexander von Humboldt, incorrectly declared that del Río's new element was only an impure sample of chromium. Del Río accepted Collet-Descotils' statement and retracted his claim.
In 1831, the Swedish chemist Nils Gabriel Sefström rediscovered the element in a new oxide he found while working with iron ores. Later that same year, Friedrich Wöhler confirmed del Río's earlier work. Sefström chose a name beginning with V, which had not been assigned to any element yet. He called the element vanadium after Old Norse Vanadís (another name for the Norse Vanr goddess Freyja, whose attributes include beauty and fertility), because of the many beautifully colored chemical compounds it produces. In 1831, the geologist George William Featherstonhaugh suggested that vanadium should be renamed "rionium" after del Río, but this suggestion was not followed.
The isolation of vanadium metal proved difficult. In 1831, Berzelius reported the production of the metal, but Henry Enfield Roscoe showed that Berzelius had in fact produced the nitride, vanadium nitride (VN). Roscoe eventually produced the metal in 1867 by reduction of vanadium(II) chloride, VCl2, with hydrogen. In 1927, pure vanadium was produced by reducing vanadium pentoxide with calcium.
The first large-scale industrial use of vanadium was in the steel alloy chassis of the Ford Model T, inspired by French race cars. Vanadium steel allowed for reduced weight while simultaneously increasing tensile strength (ca. 1905). For the first decade of the 20th century, most vanadium ore was mined by American Vanadium Company from the Minas Ragra in Peru. Later the demand for uranium rose, leading to increased mining of that metal's ores. One major uranium ore was carnotite, which also contains vanadium; thus, vanadium became available as a by-product of uranium production. Eventually uranium mining began to supply a large share of the demand for vanadium.
Vanadium is a medium-hard, ductile, steel-blue metal. It is electrically conductive and thermally insulating. Some sources describe vanadium as "soft", perhaps because it is ductile, malleable, and not brittle. Vanadium is harder than most metals and steels (see Hardnesses of the elements (data page) and iron). It has good resistance to corrosion and it is stable against alkalis and sulfuric and hydrochloric acids. It is oxidized in air at about 933 K (660 °C, 1220 °F), although an oxide passivation layer forms even at room temperature.
Naturally occurring vanadium is composed of one stable isotope, 51V, and one radioactive isotope, 50V. The latter has a half-life of 1.5×1017 years and a natural abundance of 0.25%. 51V has a nuclear spin of 7⁄2, which is useful for NMR spectroscopy. Twenty-four artificial radioisotopes have been characterized, ranging in mass number from 40 to 65. The most stable of these isotopes are 49V with a half-life of 330 days, and 48V with a half-life of 16.0 days. The remaining radioactive isotopes have half-lives shorter than an hour, most below 10 seconds. At least four isotopes have metastable excited states. Electron capture is the main decay mode for isotopes lighter than 51V. For the heavier ones, the most common mode is beta decay. The electron capture reactions lead to the formation of element 22 (titanium) isotopes, while beta decay leads to element 24 (chromium) isotopes.
The chemistry of vanadium is noteworthy for the accessibility of the four adjacent oxidation states 2–5. In aqueous solution, vanadium forms metal aquo complexes of which the colours are lilac [V(H2O)6]2+, green [V(H2O)6]3+, blue [VO(H2O)5]2+, yellow VO3−. Vanadium(II) compounds are reducing agents, and vanadium(V) compounds are oxidizing agents. Vanadium(IV) compounds often exist as vanadyl derivatives, which contain the VO2+ center.
Ammonium vanadate(V) (NH4VO3) can be successively reduced with elemental zinc to obtain the different colors of vanadium in these four oxidation states. Lower oxidation states occur in compounds such as V(CO)6, [V(CO)
and substituted derivatives.
The most commercially important compound is vanadium pentoxide. It is used as a catalyst for the production of sulfuric acid. This compound oxidizes sulfur dioxide (SO
2) to the trioxide (SO
3). In this redox reaction, sulfur is oxidized from +4 to +6, and vanadium is reduced from +5 to +4:
- V2O5 + SO2 → 2 VO2 + SO3
The catalyst is regenerated by oxidation with air:
- 4 VO2 + O2 → 2 V2O5
The vanadium redox battery utilizes all four oxidation states; one electrode uses the +5/+4 couple and the other uses the +3/+2 couple. Conversion of these oxidation states is illustrated by the reduction of a strongly acidic solution of a vanadium(V) compound with zinc dust or amalgam. The initial yellow color characteristic of the pervanadyl ion [VO2(H2O)4]+ is replaced by the blue color of [VO(H2O)5]2+, followed by the green color of [V(H2O)6]3+ and then the violet color of [V(H2O)6]2+.
In aqueous solution, vanadium(V) forms an extensive family of oxyanions. The interrelationships in this family are described by the predominance diagram, which shows at least 11 species, depending on pH and concentration. The tetrahedral orthovanadate ion, VO3−
4, is the principal species present at pH 12-14. Similar in size and charge to phosphorus(V), vanadium(V) also parallels its chemistry and crystallography. Orthovanadate VO3−
4 is used in protein crystallography to study the biochemistry of phosphate. The tetrathiovanadate [VS4]3− is analogous to the orthovanadate ion.
At lower pH values, the monomer [HVO4]2− and dimer [V2O7]− are formed, with the monomer predominant at vanadium concentration of less than c. 10−2M (pV > 2, where pV is equal to the minus value of the logarithm of the total vanadium concentration/M). The formation of the divanadate ion is analogous to the formation of the dichromate ion. As the pH is reduced, further protonation and condensation to polyvanadates occur: at pH 4-6 [H2VO4]− is predominant at pV greater than ca. 4, while at higher concentrations trimers and tetramers are formed. Between pH 2-4 decavanadate predominates, its formation from orthovanadate is represented by this condensation reaction:
- 10 [VO4]3− + 24 H+ → [V10O28]6− + 12 H2O
In decavanadate, each V(V) center is surrounded by six oxide ligands. Vanadic acid, H3VO4 exists only at very low concentrations because protonation of the tetrahedral species [H2VO4]− results in the preferential formation of the octahedral [VO2(H2O)4]+ species. In strongly acidic solutions, pH<2. [VO2(H2O)4]+ is the predominant species, while the oxide V2O5 precipitates from solution at high concentrations. The oxide is formally the acid anhydride of vanadic acid. The structures of many vanadate compounds have been determined by X-ray crystallography.
Vanadium(V) forms various peroxo complexes, most notably in the active site of the vanadium-containing bromoperoxidase enzymes. The species VO(O)2(H2O)4+ is stable in acidic solutions. In alkaline solutions, species with 2, 3 and 4 peroxide groups are known; the last forms violet salts with the formula M3V(O2)4 nH2O (M= Li, Na, etc.), in which the vanadium has an 8-coordinate dodecahedral structure.
Twelve binary halides, compounds with the formula VXn (n=2..5), are known. VI4, VCl5, VBr5, and VI5 do not exist or are extremely unstable. In combination with other reagents, VCl4 is used as a catalyst for polymerization of dienes. Like all binary halides, those of vanadium are Lewis acidic, especially those of V(IV) and V(V). Many of the halides form octahedral complexes with the formula VXnL6−n (X= halide; L= other ligand).
Many vanadium oxyhalides (formula VOmXn) are known. The oxytrichloride and oxytrifluoride (VOCl3 and VOF3) are the most widely studied. Akin to POCl3, they are volatile, adopt tetrahedral structures in the gas phase, and are Lewis acidic.
Complexes of vanadium(II) and (III) are relatively exchange inert and reducing. Those of V(IV) and V(V) are oxidants. Vanadium ion is rather large and some complexes achieve coordination numbers greater than 6, as is the case in [V(CN)7]4−. Oxovanadium(V) also forms 7 coordinate coordination complexes with tetradentate ligands and peroxides and these complexes are used for oxidative brominations and thioether oxidations. The coordination chemistry of V4+ is dominated by the vanadyl center, VO2+, which binds four other ligands strongly and one weakly (the one trans to the vanadyl center). An example is vanadyl acetylacetonate (V(O)(O2C5H7)2). In this complex, the vanadium is 5-coordinate, square pyramidal, meaning that a sixth ligand, such as pyridine, may be attached, though the association constant of this process is small. Many 5-coordinate vanadyl complexes have a trigonal bypyramidal geometry, such as VOCl2(NMe3)2. The coordination chemistry of V5+ is dominated by the relatively stable dioxovanadium coordination complexes which are often formed by aerial oxidation of the vanadium(IV) precursors indicating the stability of the +5 oxidation state and ease of interconversion between the +4 and +5 states.
Organometallic chemistry of vanadium is well developed, although it has mainly only academic significance. Vanadocene dichloride is a versatile starting reagent and even finds some applications in organic chemistry. Vanadium carbonyl, V(CO)6, is a rare example of a paramagnetic metal carbonyl. Reduction yields V(CO)−
6 (isoelectronic with Cr(CO)6), which may be further reduced with sodium in liquid ammonia to yield V(CO)3−
5 (isoelectronic with Fe(CO)5).
The cosmic abundance of vanadium in the universe is 0.0001%, making the element nearly as common as copper or zinc. Vanadium is detected spectroscopically in light from the Sun and sometimes in the light from other stars.
Vanadium is the 20th most abundant element in the earth's crust; metallic vanadium is rare in nature (known as the mineral vanadium, native vanadium), but vanadium compounds occur naturally in about 65 different minerals.
At the beginning of the 20th century a large deposit of vanadium ore was discovered. For several years this patrónite (VS4) deposit was a economically significant source for vanadium ore. With the production of radium in the 1910s and 1920s from carnotite (K2(UO2)2(VO4)2·3H2O) vanadium became available as a side product of radium and uranium production. Vanadinite (Pb5(VO4)3Cl) and other vanadium bearing minerals are only mined in exceptional cases. With the rising demand, now much of the world's vanadium production is sourced from vanadium-bearing magnetite found in ultramafic gabbro bodies. If this titanomagnetite is used to produce iron most of the vanadium is ending in the slag and is extracted from there.
Vanadium is also present in bauxite and in deposits of crude oil, coal, oil shale, and tar sands. In crude oil, concentrations up to 1200 ppm have been reported. When such oil products are burned, traces of vanadium may cause corrosion in engines and boilers. An estimated 110,000 tonnes of vanadium per year are released into the atmosphere by burning fossil fuels.
The vanadyl ion is abundant in seawater, having an average concentration of 30 nM. Some mineral water springs also contain the ion in high concentrations. For example, springs near Mount Fuji contain as much as 54 μg per liter.
Vanadium metal is obtained by a multistep process that begins with the roasting of crushed ore with NaCl or Na2CO3 at about 850 °C to give sodium metavanadate (NaVO3). An aqueous extract of this solid is acidified to give "red cake", a polyvanadate salt, which is reduced with calcium metal. As an alternative for small-scale production, vanadium pentoxide is reduced with hydrogen or magnesium. Many other methods are also in use, in all of which vanadium is produced as a byproduct of other processes. Purification of vanadium is possible by the crystal bar process developed by Anton Eduard van Arkel and Jan Hendrik de Boer in 1925. It involves the formation of the metal iodide, in this example vanadium(III) iodide, and the subsequent decomposition to yield pure metal:
- 2 V + 3 I2 ⇌ 2 VI3
Most vanadium is used as a steel alloy called ferrovanadium. Ferrovanadium is produced directly by reducing a mixture of vanadium oxide, iron oxides and iron in an electric furnace. The vanadium ends up in pig iron produced from vanadium-bearing magnetite. Depending on the ore used, the slag contains up to 25% of vanadium.
Approximately 85% of vanadium produced is used as ferrovanadium or as a steel additive. The considerable increase of strength in steel containing small amounts of vanadium was discovered in the early 20th century. Vanadium forms stable nitrides and carbides, resulting in a significant increase in the strength of steel. From that time on, vanadium steel was used for applications in axles, bicycle frames, crankshafts, gears, and other critical components. There are two groups of vanadium steel alloys. Vanadium high-carbon steel alloys contain 0.15% to 0.25% vanadium, and high-speed tool steels (HSS) have a vanadium content of 1% to 5%. For high-speed tool steels, a hardness above HRC 60 can be achieved. HSS steel is used in surgical instruments and tools. Powder-metallurgic alloys contain up to 18% percent vanadium. The high content of vanadium carbides in those alloys increases wear resistance significantly. One application for those alloys is tools and knives.
Vanadium stabilizes the beta form of titanium and increases the strength and temperature stability of titanium. Mixed with aluminium in titanium alloys, it is used in jet engines, high-speed airframes and dental implants. The most common alloy for seamless tubing is Titanium 3/2.5 containing 2.5% vanadium, the titanium alloy of choice in the aerospace, defense, and bicycle industries. Another common alloy, primarily produced in sheets, is Titanium 6AL-4V, a titanium alloy with 6% aluminium and 4% vanadium.
Several vanadium alloys show superconducting behavior. The first A15 phase superconductor was a vanadium compound, V3Si, which was discovered in 1952. Vanadium-gallium tape is used in superconducting magnets (17.5 teslas or 175,000 gauss). The structure of the superconducting A15 phase of V3Ga is similar to that of the more common Nb3Sn and Nb3Ti.
It has been proposed that a small amount, 40 to 270 ppm, of vanadium in Wootz steel and Damascus steel significantly improved the strength of the product, though the source of the vanadium is unclear.
Vanadium compounds are used extensively as catalysts; for example, the most common oxide of vanadium, vanadium pentoxide V2O5, is used as a catalyst in manufacturing sulfuric acid by the contact process and as an oxidizer in maleic anhydride production. Vanadium pentoxide is used in ceramics. Vanadium is an important component of mixed metal oxide catalysts used in the oxidation of propane and propylene to acrolein, acrylic acid or the ammoxidation of propylene to acrylonitrile. In service, the oxidation state of vanadium changes dynamically and reversibly with the oxygen and the steam content of the reacting feed mixture. Another oxide of vanadium, vanadium dioxide VO2, is used in the production of glass coatings, which blocks infrared radiation (and not visible light) at a specific temperature. Vanadium oxide can be used to induce color centers in corundum to create simulated alexandrite jewelry, although alexandrite in nature is a chrysoberyl.
The Vanadium redox battery, a type of flow battery, is an electrochemical cell consisting of aqueous vanadium ions in different oxidation states. Batteries of the type were first proposed in the 1930s and developed commercially from the 1980s onwards. Cells use +5 and +2 formal oxidization state ions. Vanadium redox batteries are used commercially for grid energy storage.
Vanadate can be used for protecting steel against rust and corrosion by conversion coating. Vanadium foil is used in cladding titanium to steel because it is compatible with both iron and titanium. The moderate thermal neutron-capture cross-section and the short half-life of the isotopes produced by neutron capture makes vanadium a suitable material for the inner structure of a fusion reactor.
Lithium vanadium oxide has been proposed for use as a high energy density anode for lithium ion batteries, at 745 Wh/L when paired with a lithium cobalt oxide cathode. Vanadium phosphates have been proposed as the cathode in the lithium vanadium phosphate battery, another type of lithium-ion battery.
A number of species of marine algae produce vanadium bromoperoxidase as well as the closely related chloroperoxidase (which may use a heme or vanadium cofactor) and iodoperoxidases. The bromoperoxidase produces an estimated 1–2 million tons of bromoform and 56,000 tons of bromomethane annually. Most naturally occurring organobromine compounds are produced by this enzyme, catalyzing the following reaction (R-H is hydrocarbon substrate):
- R-H + Br− + H2O2 → R-Br + H2O + OH−
A vanadium nitrogenase is used by some nitrogen-fixing micro-organisms, such as Azotobacter. In this role, vanadium replaces more-common molybdenum or iron, and gives the nitrogenase slightly different properties.
Vanadium accumulation in tunicates and ascidiansEdit
Vanadium is essential to ascidians and tunicates, where it is stored in the highly acidified vacuoles of certain blood cell types, designated "vanadocytes". Vanabins (vanadium binding proteins) have been identified in the cytoplasm of such cells. The concentration of vanadium in the blood of ascidians is as much as ten million times higher[specify] than the surrounding seawater, which normally contains 1 to 2 µg/l. The function of this vanadium concentration system and these vanadium-bearing proteins is still unknown, but the vanadocytes are later deposited just under the outer surface of the tunic where they may deter predation.
Amanita muscaria and related species of macrofungi accumulate vanadium (up to 500 mg/kg in dry weight). Vanadium is present in the coordination complex amavadin in fungal fruit-bodies. The biological importance of the accumulation is unknown. Toxic or peroxidase enzyme functions have been suggested.
Deficiencies in vanadium result in reduced growth in rats. The U.S. Institute of Medicine has not confirmed that vanadium is an essential nutrient for humans, so neither a Recommended Dietary Intake nor an Adequate Intake have been established. Dietary intake is estimated at 6 to 18 µg/day, with less than 5% absorbed. The Tolerable Upper Intake Level (UL) of dietary vanadium, beyond which adverse effects may occur, is set at 1.8 mg/day.
Vanadyl sulfate as a dietary supplement has been researched as a means of increasing insulin sensitivity or otherwise improving glycemic control in people who are diabetic. Some of the trials had significant treatment effects, but were deemed as being of poor study quality. The amounts of vanadium used in these trials (30 to 150 mg) far exceeded the safe upper limit. The conclusion of the systemic review was "There is no rigorous evidence that oral vanadium supplementation improves glycaemic control in type 2 diabetes. The routine use of vanadium for this purpose cannot be recommended."
In astrobiology, it has been suggested that discrete vanadium accumulations on Mars could be a potential microbial biosignature, when used in conjunction with Raman spectroscopy and morphology.
All vanadium compounds should be considered toxic. Tetravalent VOSO4 has been reported to be at least 5 times more toxic than trivalent V2O3. The Occupational Safety and Health Administration (OSHA) has set an exposure limit of 0.05 mg/m3 for vanadium pentoxide dust and 0.1 mg/m3 for vanadium pentoxide fumes in workplace air for an 8-hour workday, 40-hour work week. The National Institute for Occupational Safety and Health (NIOSH) has recommended that 35 mg/m3 of vanadium be considered immediately dangerous to life and health, that is, likely to cause permanent health problems or death.
Vanadium compounds are poorly absorbed through the gastrointestinal system. Inhalation of vanadium and vanadium compounds results primarily in adverse effects on the respiratory system. Quantitative data are, however, insufficient to derive a subchronic or chronic inhalation reference dose. Other effects have been reported after oral or inhalation exposures on blood parameters, liver, neurological development, and other organs in rats.
There is little evidence that vanadium or vanadium compounds are reproductive toxins or teratogens. Vanadium pentoxide was reported to be carcinogenic in male rats and in male and female mice by inhalation in an NTP study, although the interpretation of the results has recently been disputed. The carcinogenicity of vanadium has not been determined by the United States Environmental Protection Agency.
Vanadium traces in diesel fuels are the main fuel component in high temperature corrosion. During combustion, vanadium oxidizes and reacts with sodium and sulfur, yielding vanadate compounds with melting points as low as 530 °C, which attack the passivation layer on steel and render it susceptible to corrosion. The solid vanadium compounds also abrade engine components.
- Meija, Juris; et al. (2016). "Atomic weights of the elements 2013 (IUPAC Technical Report)". Pure and Applied Chemistry. 88 (3): 265–91. doi:10.1515/pac-2015-0305.
- Weast, Robert (1984). CRC, Handbook of Chemistry and Physics. Boca Raton, Florida: Chemical Rubber Company Publishing. pp. E110. ISBN 0-8493-0464-4.
- Cintas, Pedro (2004). "The Road to Chemical Names and Eponyms: Discovery, Priority, and Credit". Angewandte Chemie International Edition. 43 (44): 5888–94. doi:10.1002/anie.200330074. PMID 15376297.
- Sefström, N. G. (1831). "Ueber das Vanadin, ein neues Metall, gefunden im Stangeneisen von Eckersholm, einer Eisenhütte, die ihr Erz von Taberg in Småland bezieht". Annalen der Physik und Chemie. 97 (1): 43–49. Bibcode:1831AnP....97...43S. doi:10.1002/andp.18310970103.
- Featherstonhaugh, George William (1831). "New Metal, provisionally called Vanadium". The Monthly American Journal of Geology and Natural Science: 69.
- Roscoe, Henry E. (1869–1870). "Researches on Vanadium. Part II". Proceedings of the Royal Society of London. 18 (114–122): 37–42. doi:10.1098/rspl.1869.0012.
- Marden, J. W.; Rich, M. N. (1927). "Vanadium". Industrial and Engineering Chemistry. 19 (7): 786–788. doi:10.1021/ie50211a012.
- Betz, Frederick (2003). Managing Technological Innovation: Competitive Advantage from Change. Wiley-IEEE. pp. 158–159. ISBN 978-0-471-22563-8.
- Phillip Maxwell Busch (1961). Vanadium: A Materials Survey. U.S. Department of the Interior, Bureau of Mines.
- Wise, James M. (May 2018). "Remarkable folded dacitic dikes at Mina Ragra, Peru".
- Henze, M. (1911). "Untersuchungen über das Blut der Ascidien. I. Mitteilung". Z. Physiol. Chem. 72 (5–6): 494–50. doi:10.1515/bchm2.1911.72.5-6.494.
- Michibata, H.; Uyama, T.; Ueki, T.; Kanamori, K. (2002). "Vanadocytes, cells hold the key to resolving the highly selective accumulation and reduction of vanadium in ascidians". Microscopy Research and Technique. 56 (6): 421–434. doi:10.1002/jemt.10042. PMID 11921344.
- George F. Vander Voort (1984). Metallography, principles and practice. ASM International. pp. 137–. ISBN 978-0-87170-672-0. Retrieved 17 September 2011.
- François Cardarelli (2008). Materials handbook: a concise desktop reference. Springer. pp. 338–. ISBN 978-1-84628-668-1. Retrieved 17 September 2011.
- Holleman, Arnold F.; Wiberg, Egon; Wiberg, Nils (1985). "Vanadium". Lehrbuch der Anorganischen Chemie (in German) (91–100 ed.). Walter de Gruyter. pp. 1071–1075. ISBN 978-3-11-007511-3.
- Audi, Georges; Bersillon, Olivier; Blachot, Jean; Wapstra, Aaldert Hendrik (2003), "The NUBASE evaluation of nuclear and decay properties", Nuclear Physics A, 729: 3–128, Bibcode:2003NuPhA.729....3A, doi:10.1016/j.nuclphysa.2003.11.001
- Günter Bauer, Volker Güther, Hans Hess, Andreas Otto, Oskar Roidl, Heinz Roller, Siegfried Sattelberger "Vanadium and Vanadium Compounds" in Ullmann's Encyclopedia of Industrial Chemistry, 2005, Wiley-VCH, Weinheim. doi:10.1002/14356007.a27_367
- Greenwood, Norman N.; Earnshaw, Alan (1997). Chemistry of the Elements (2nd ed.). Butterworth-Heinemann. p. 984. ISBN 978-0-08-037941-8.
- Sinning, Irmgard; Hol, Wim G. J. (2004). "The power of vanadate in crystallographic investigations of phosphoryl transfer enzymes". FEBS Letters. 577 (3): 315–21. doi:10.1016/j.febslet.2004.10.022. PMID 15556602.
- Seargeant, Lorne E.; Stinson, Robert A. (1979). "Inhibition of human alkaline phosphatases by vanadate". Biochemical Journal. 181 (1): 247–50. doi:10.1042/bj1810247. PMC 1161148. PMID 486156.
- Greenwood, Norman N.; Earnshaw, Alan (1997). Chemistry of the Elements (2nd ed.). Butterworth-Heinemann. p. 988. ISBN 978-0-08-037941-8.
- Al-Kharafi, F. M.; Badawy, W. A. (1997). "Electrochemical behavior of vanadium in aqueous solutions of different pH". Electrochimica Acta. 42 (4): 579–586. doi:10.1016/S0013-4686(96)00202-2.
- Greenwood, Norman N.; Earnshaw, Alan (1997). Chemistry of the Elements (2nd ed.). Butterworth-Heinemann. ISBN 978-0-08-037941-8., p994.
- Strukul, Giorgio (1992). Catalytic oxidations with hydrogen peroxide as oxidant. Springer. p. 128. ISBN 978-0-7923-1771-5.
- Greenwood, Norman N.; Earnshaw, Alan (1997). Chemistry of the Elements (2nd ed.). Butterworth-Heinemann. p. 993. ISBN 978-0-08-037941-8.
- Greenwood, Norman N.; Earnshaw, Alan (1997). Chemistry of the Elements (2nd ed.). Butterworth-Heinemann. ISBN 978-0-08-037941-8.
- Wilkinson, G. & Birmingham, J.G. (1954). "Bis-cyclopentadienyl Compounds of Ti, Zr, V, Nb and Ta". Journal of the American Chemical Society. 76 (17): 4281–4284. doi:10.1021/ja01646a008.
- Bellard, S.; Rubinson, K. A.; Sheldrick, G. M. (1979). "Crystal and molecular structure of vanadium hexacarbonyl". Acta Crystallographica. B35 (2): 271–274. doi:10.1107/S0567740879003332.
- Elschenbroich, C.; Salzer A. (1992). Organometallics: A Concise Introduction. Wiley-VCH. ISBN 978-3-527-28165-7.
- Rehder, Dieter (2008). Bioinorganic Vanadium Chemistry. Inorganic Chemistry (1st ed.). Hamburg, Germany: John Wiley & Sons, Ltd. pp. 5 & 9–10. doi:10.1002/9780470994429. ISBN 9780470065099.
- Cowley, C. R.; Elste, G. H.; Urbanski, J. L. (1978). "Vanadium abundances in early A stars". Publications of the Astronomical Society of the Pacific. 90: 536. Bibcode:1978PASP...90..536C. doi:10.1086/130379.
- Proceedings. National Cotton Council of America. 1991.
- Ostrooumov, M., and Taran, Y., 2015. Discovery of Native Vanadium, a New Mineral from the Colima Volcano, State of Colima (Mexico). Revista de la Sociedad Española de Mineralogía 20, 109-110
- "Vanadium: Vanadium mineral information and data". Mindat.org. Retrieved 2 March 2016.
- "mineralogical data about Patrónite". mindata.org. Retrieved 19 January 2009.
- Hukkanen, E.; Walden, H. (1985). "The production of vanadium and steel from titanomagnetites". International Journal of Mineral Processing. 15 (1–2): 89–102. doi:10.1016/0301-7516(85)90026-2.
- <Steinberg, W.S.; Geyser, W.; Nell, J. "The history and development of the pyrometallurgical processes at Evraz Highveld Steel & Vanadium" (PDF).
- Magyar, Michael J. "Mineral Commodity Summaries 2015: Vanadium" (PDF). United States Geological Survey. Retrieved 3 June 2015.
- Pearson, C. D.; Green J. B. (1993). "Vanadium and nickel complexes in petroleum resid acid, base, and neutral fractions". Energy Fuels. 7 (3): 338–346. doi:10.1021/ef00039a001.
- Anke, Manfred (2004). "Vanadium – An element both essential and toxic to plants, animals and humans?". Anal. Real Acad. Nac. Farm. 70: 961.
- Moskalyk, R. R.; Alfantazi, A. M. (2003). "Processing of vanadium: a review". Minerals Engineering. 16 (9): 793–805. doi:10.1016/S0892-6875(03)00213-9.
- Carlson, O. N.; Owen, C. V. (1961). "Preparation of High-Purity Vanadium Metals by the Iodide Refining Process". Journal of the Electrochemical Society. 108: 88. doi:10.1149/1.2428019.
- Chandler, Harry (1998). Metallurgy for the Non-metallurgist. ASM International. pp. 6–7. ISBN 978-0-87170-652-2.
- Davis, Joseph R. (1995). Tool Materials: Tool Materials. ASM International. ISBN 978-0-87170-545-7.
- Oleg D. Neikov; Stanislav Naboychenko; Irina Mourachova; Victor G. Gopienko; Irina V. Frishberg; Dina V. Lotsko (24 February 2009). Handbook of Non-Ferrous Metal Powders: Technologies and Applications. p. 490. ISBN 9780080559407. Retrieved 17 October 2013.
- "Technical Supplement: Titanium". Seven Cycles. Retrieved 1 November 2016.
- Peters, Manfred; Leyens, C. (2002). "Metastabile β-Legierungen". Titan und Titanlegierungen. Wiley-VCH. pp. 23–24. ISBN 978-3-527-30539-1.
- Hardy, George F.; Hulm, John K. (1953). "Superconducting Silicides and Germanides". Physical Review. 89 (4): 884. Bibcode:1953PhRv...89Q.884H. doi:10.1103/PhysRev.89.884.
- Markiewicz, W.; Mains, E.; Vankeuren, R.; Wilcox, R.; Rosner, C.; Inoue, H.; Hayashi, C.; Tachikawa, K. (1977). "A 17.5 Tesla superconducting concentric Nb3Sn and V3Ga magnet system". IEEE Transactions on Magnetics. 13 (1): 35–37. Bibcode:1977ITM....13...35M. doi:10.1109/TMAG.1977.1059431.
- Verhoeven, J. D.; Pendray, A. H.; Dauksch, W. E. (1998). "The key role of impurities in ancient damascus steel blades". Journal of the Minerals, Metals and Materials Society. 50 (9): 58–64. Bibcode:1998JOM....50i..58V. doi:10.1007/s11837-998-0419-y.
- Langeslay, Ryan R.; Kaphan, David M.; Marshall, Christopher L.; Stair, Peter C.; Sattelberger, Alfred P.; Delferro, Massimiliano (8 October 2018). "Catalytic Applications of Vanadium: A Mechanistic Perspective". Chemical Reviews. doi:10.1021/acs.chemrev.8b00245. PMID 30296048.
- Eriksen, K. M.; Karydis, D. A.; Boghosian, S.; Fehrmann, R. (1995). "Deactivation and Compound Formation in Sulfuric-Acid Catalysts and Model Systems". Journal of Catalysis. 155 (1): 32–42. doi:10.1006/jcat.1995.1185.
- Abon, Michel; Volta, Jean-Claude (1997). "Vanadium phosphorus oxides for n-butane oxidation to maleic anhydride". Applied Catalysis A: General. 157 (1–2): 173–193. doi:10.1016/S0926-860X(97)00016-1.
- Lide, David R. (2004). "vanadium". CRC Handbook of Chemistry and Physics. Boca Raton: CRC Press. pp. 4–34. ISBN 978-0-8493-0485-9.
- Fierro, J. G. L., ed. (2006). Metal Oxides, Chemistry and Applications. CRC Press. pp. 415–455. ISBN 9780824723712.
- Kinetic studies of propane oxidation on Mo and V based mixed oxide catalysts (PhD Thesis). Berlin: Technische Universität. 2011. hdl:11858/00-001M-0000-0012-3000-A.[page needed]
- Amakawa, Kazuhiko; Kolen’ko, Yury V.; Villa, Alberto; Schuster, Manfred E/; Csepei, Lénárd-István; Weinberg, Gisela; Wrabetz, Sabine; d’Alnoncourt, Raoul Naumann; Girgsdies, Frank; Prati, Laura; Schlögl, Robert; Trunschke, Annette (2013). "Multifunctionality of Crystalline MoV(TeNb) M1 Oxide Catalysts in Selective Oxidation of Propane and Benzyl Alcohol". ACS Catalysis. 3 (6): 1103–1113. doi:10.1021/cs400010q. hdl:11858/00-001M-0000-000E-FA39-1.
- Hävecker, Michael; Wrabetz, Sabine; Kröhnert, Jutta; Csepei, Lenard-Istvan; Naumann d’Alnoncourt, Raoul; Kolen’ko, Yury V.; Girgsdies, Frank; Schlögl, Robert; Trunschke, Annette (January 2012). "Surface chemistry of phase-pure M1 MoVTeNb oxide during operation in selective oxidation of propane to acrylic acid". Journal of Catalysis. 285 (1): 48–60. doi:10.1016/j.jcat.2011.09.012. hdl:11858/00-001M-0000-0012-1BEB-F.
- Naumann d’Alnoncourt, Raoul; Csepei, Lénárd-István; Hävecker, Michael; Girgsdies, Frank; Schuster, Manfred E.; Schlögl, Robert; Trunschke, Annette (March 2014). "The reaction network in propane oxidation over phase-pure MoVTeNb M1 oxide catalysts". Journal of Catalysis. 311: 369–385. doi:10.1016/j.jcat.2013.12.008. hdl:11858/00-001M-0000-0014-F434-5.
- Manning, Troy D.; Parkin, Ivan P.; Clark, Robin J. H.; Sheel, David; Pemble, Martyn E.; Vernadou, Dimitra (2002). "Intelligent window coatings: atmospheric pressure chemical vapour deposition of vanadium oxides". Journal of Materials Chemistry. 12 (10): 2936–2939. doi:10.1039/b205427m.
- White, Willam B.; Roy, Rustum; McKay, Chrichton (1962). "The Alexandrite Effect: And Optical Study" (PDF). American Mineralogist. 52: 867–871.
- Joerissen, Ludwig; Garche, Juergen; Fabjan, Ch.; Tomazic G. (2004). "Possible use of vanadium redox-flow batteries for energy storage in small grids and stand-alone photovoltaic systems". Journal of Power Sources. 127 (1–2): 98–104. Bibcode:2004JPS...127...98J. doi:10.1016/j.jpowsour.2003.09.066.
- Rychcik, M.; Skyllas-Kazacos, M. (1988). "Characteristics of a new all-vanadium redox flow battery". Journal of Power Sources. 22 (1): 59–67. Bibcode:1988JPS....22...59R. doi:10.1016/0378-7753(88)80005-3. ISSN 0378-7753.
- Guan, H.; Buchheit R. G. (2004). "Corrosion Protection of Aluminum Alloy 2024-T3 by Vanadate Conversion Coatings". Corrosion. 60 (3): 284–296. doi:10.5006/1.3287733.
- Lositskii, N. T.; Grigor'ev A. A.; Khitrova, G. V. (1966). "Welding of chemical equipment made from two-layer sheet with titanium protective layer (review of foreign literature)". Chemical and Petroleum Engineering. 2 (12): 854–856. doi:10.1007/BF01146317.
- Matsui, H.; Fukumoto, K.; Smith, D. L.; Chung, Hee M.; Witzenburg, W. van; Votinov, S. N. (1996). "Status of vanadium alloys for fusion reactors". Journal of Nuclear Materials. 233–237 (1): 92–99. Bibcode:1996JNuM..233...92M. doi:10.1016/S0022-3115(96)00331-5.
- "Vanadium Data Sheet" (PDF). ATI Wah Chang. Archived from the original (PDF) on 25 February 2009. Retrieved 16 January 2009.
- Kariatsumari, Koji (February 2008). "Li-Ion Rechargeable Batteries Made Safer". Nikkei Business Publications, Inc. Archived from the original on 12 September 2011. Retrieved 10 December 2008.
- Crans, Debbie C.; LaRee, Henry; Cardiff, Gabriel; Posner, Barry I. (2019). "Chapter 8. Developing Vanadium as an Antidiabetic or Anticancer Drug: A Clinical and Historical Perspective". In Sigel, Astrid; Freisinger, Eva; Sigel, Roland K. O.; Carver, Peggy L. (Guest editor) (eds.). Essential Metals in Medicine:Therapeutic Use and Toxicity of Metal Ions in the Clinic. Metal Ions in Life Sciences. 19. Berlin: de Gruyter GmbH. pp. 203–230. doi:10.1515/9783110527872-014. ISBN 978-3-11-052691-2.
- Crans, Debbie C.; Yang, Liling; Haase, Allison; Yang, Xiaogai (2018). "Chapter 9. Health Benefits of Vanadium and Its Potential as an Anticancer Agent". In Sigel, Astrid; Sigel, Helmut; Freisinger, Eva; Sigel, Roland K. O. (eds.). Metallo-Drugs: Development and Action of Anticancer Agents. Metal Ions in Life Sciences. 18. Berlin: de Gruyter GmbH. pp. 251–279. doi:10.1515/9783110470734-015. ISBN 9783110470734. PMID 29394028.
- Sigel, Astrid; Sigel, Helmut, eds. (1995). Vanadium and Its Role in Life. Metal Ions in Biological Systems. 31. CRC. ISBN 978-0-8247-9383-8.
- Gribble, Gordon W. (1999). "The diversity of naturally occurring organobromine compounds". Chemical Society Reviews. 28 (5): 335–346. doi:10.1039/a900201d.
- Butler, Alison; Carter-Franklin, Jayme N. (2004). "The role of vanadium bromoperoxidase in the biosynthesis of halogenated marine natural products". Natural Product Reports. 21 (1): 180–8. doi:10.1039/b302337k. PMID 15039842.
- Robson, R. L.; Eady, R. R.; Richardson, T. H.; Miller, R. W.; Hawkins, M.; Postgate, J. R. (1986). "The alternative nitrogenase of Azotobacter chroococcum is a vanadium enzyme". Nature. 322 (6077): 388–390. Bibcode:1986Natur.322..388R. doi:10.1038/322388a0.
- Smith, M. J. (1989). "Vanadium biochemistry: The unknown role of vanadium-containing cells in ascidians (sea squirts)". Experientia. 45 (5): 452–7. doi:10.1007/BF01952027. PMID 2656286.
- MacAra, Ian G.; McLeod, G. C.; Kustin, Kenneth (1979). "Tunichromes and metal ion accumulation in tunicate blood cells". Comparative Biochemistry and Physiology B. 63 (3): 299–302. doi:10.1016/0305-0491(79)90252-9.
- Trefry, John H.; Metz, Simone (1989). "Role of hydrothermal precipitates in the geochemical cycling of vanadium". Nature. 342 (6249): 531–533. Bibcode:1989Natur.342..531T. doi:10.1038/342531a0.
- Weiss, H.; Guttman, M. A.; Korkisch, J.; Steffan, I. (1977). "Comparison of methods for the determination of vanadium in sea-water". Talanta. 24 (8): 509–11. doi:10.1016/0039-9140(77)80035-0. PMID 18962130.
- Ruppert, Edward E.; Fox, Richard, S.; Barnes, Robert D. (2004). Invertebrate Zoology (7th ed.). Cengage Learning. p. 947. ISBN 978-81-315-0104-7.
- Kneifel, Helmut; Bayer, Ernst (1997). "Determination of the Structure of the Vanadium Compound, Amavadine, from Fly Agaric". Angewandte Chemie International Edition in English. 12 (6): 508. doi:10.1002/anie.197305081. ISSN 0570-0833.
- Falandysz, J.; Kunito, T.; Kubota, R.; Lipka, K.; Mazur, A.; Falandysz, Justyna J.; Tanabe, S. (2007). "Selected elements in fly agaric Amanita muscaria". Journal of Environmental Science and Health, Part A. 42 (11): 1615–1623. doi:10.1080/10934520701517853. PMID 17849303.
- Berry, Robert E.; Armstrong, Elaine M.; Beddoes, Roy L.; Collison, David; Ertok, Nigar; Helliwell, Madeleine; Garner, David (1999). "The Structural Characterization of Amavadin". Angewandte Chemie International Edition. 38 (6): 795–797. doi:10.1002/(SICI)1521-3773(19990315)38:6<795::AID-ANIE795>3.0.CO;2-7. PMID 29711812.
- Schwarz, Klaus; Milne, David B. (1971). "Growth Effects of Vanadium in the Rat". Science. 174 (4007): 426–428. Bibcode:1971Sci...174..426S. doi:10.1126/science.174.4007.426. JSTOR 1731776. PMID 5112000.
- Nickel. IN: Dietary Reference Intakes for Vitamin A, Vitamin K, Arsenic, Boron, Chromium, Copper, Iodine, Iron, Manganese, Molybdenum, Nickel, Silicon, Vanadium, and Copper. National Academy Press. 2001, PP. 532–543.
- Smith DM, Pickering RM, Lewith GT (2008). "A systematic review of vanadium oral supplements for glycaemic control in type 2 diabetes mellitus". QJM. 101 (5): 351–8. doi:10.1093/qjmed/hcn003. PMID 18319296.
- "Vanadium (vanadyl sulfate). Monograph". Altern Med Rev. 14 (2): 177–80. 2009. PMID 19594227.
- Lynch, Brendan M. (21 September 2017). "Hope to discover sure signs of life on Mars? New research says look for the element vanadium". PhysOrg. Retrieved 14 October 2017.
- Marshall, C. P; Olcott Marshall, A; Aitken, J. B; Lai, B; Vogt, S; Breuer, P; Steemans, P; Lay, P. A (2017). "Imaging of Vanadium in Microfossils: A New Potential Biosignature". Astrobiology. 17 (11): 1069–1076. doi:10.1089/ast.2017.1709. PMID 28910135.
- Roschin, A. V. (1967). "Toxicology of vanadium compounds used in modern industry". Gig Sanit. (Water Res.). 32 (6): 26–32. PMID 5605589.
- "Occupational Safety and Health Guidelines for Vanadium Pentoxide". Occupational Safety and Health Administration. Archived from the original on 6 January 2009. Retrieved 29 January 2009.
- Sax, N. I. (1984). Dangerous Properties of Industrial Materials (6th ed.). Van Nostrand Reinhold Company. pp. 2717–2720.
- Ress, N. B.; et al. (2003). "Carcinogenicity of inhaled vanadium pentoxide in F344/N rats and B6C3F1 mice". Toxicological Sciences. 74 (2): 287–296. doi:10.1093/toxsci/kfg136. PMID 12773761.
- Wörle-Knirsch, Jörg M.; Kern, Katrin; Schleh, Carsten; Adelhelm, Christel; Feldmann, Claus & Krug, Harald F. (2007). "Nanoparticulate Vanadium Oxide Potentiated Vanadium Toxicity in Human Lung Cells". Environ. Sci. Technol. 41 (1): 331–336. Bibcode:2007EnST...41..331W. doi:10.1021/es061140x. PMID 17265967.
- Ścibior, A.; Zaporowska, H.; Ostrowski, J. (2006). "Selected haematological and biochemical parameters of blood in rats after subchronic administration of vanadium and/or magnesium in drinking water". Archives of Environmental Contamination and Toxicology. 51 (2): 287–295. doi:10.1007/s00244-005-0126-4. PMID 16783625.
- Gonzalez-Villalva, A.; et al. (2006). "Thrombocytosis induced in mice after subacute and subchronic V2O5 inhalation". Toxicology and Industrial Health. 22 (3): 113–116. doi:10.1191/0748233706th250oa. PMID 16716040.
- Kobayashi, Kazuo; Himeno, Seiichiro; Satoh, Masahiko; Kuroda, Junji; Shibata, Nobuo; Seko, Yoshiyuki; Hasegawa, Tatsuya (2006). "Pentavalent vanadium induces hepatic metallothionein through interleukin-6-dependent and -independent mechanisms". Toxicology. 228 (2–3): 162–170. doi:10.1016/j.tox.2006.08.022. PMID 16987576.
- Soazo, Marina; Garcia, Graciela Beatriz (2007). "Vanadium exposure through lactation produces behavioral alterations and CNS myelin deficit in neonatal rats". Neurotoxicology and Teratology. 29 (4): 503–510. doi:10.1016/j.ntt.2007.03.001. PMID 17493788.
- Barceloux, Donald G.; Barceloux, Donald (1999). "Vanadium". Clinical Toxicology. 37 (2): 265–278. doi:10.1081/CLT-100102425. PMID 10382561.
- Duffus, J. H. (2007). "Carcinogenicity classification of vanadium pentoxide and inorganic vanadium compounds, the NTP study of carcinogenicity of inhaled vanadium pentoxide, and vanadium chemistry". Regulatory Toxicology and Pharmacology. 47 (1): 110–114. doi:10.1016/j.yrtph.2006.08.006. PMID 17030368.
- Opreskos, Dennis M. (1991). "Toxicity Summary for Vanadium". Oak Ridge National Laboratory. Retrieved 8 November 2008.
- Woodyard, Doug (18 August 2009). Pounder's Marine Diesel Engines and Gas Turbines. p. 92. ISBN 9780080943619.
- Totten, George E.; Westbrook, Steven R.; Shah, Rajesh J. (1 June 2003). Fuels and Lubricants Handbook: Technology, Properties, Performance, and Testing. p. 152. ISBN 9780803120969.
- Slebodnick, Carla; et al. (1999). "Modeling the Biological Chemistry of Vanadium: Structural and Reactivity Studies Elucidating Biological Function". In Hill, Hugh A.O.; et al. (eds.). Metal sites in proteins and models: phosphatases, Lewis acids, and vanadium. Springer. ISBN 978-3-540-65553-4.
|Wikimedia Commons has media related to Vanadium.|
|Look up vanadium in Wiktionary, the free dictionary.|
- Research papers
- [permanent dead link] National Instrument Vanadium Technical Report Vanadium recovery methods
- ATSDR – ToxFAQs: Vanadium
- Vanadium concentration in seawater and estuary environments is around 1.5-3.3 ug/kg .
- Vanadium speciation and cycling in coastal waters 
- Ocean anoxia and the concentrations of Molybdenum and Vanadium in seawater